{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In vitro studies on human ovarian carcinoma A2780 cells were carried out to investigate the cytotoxicity of free PTX , HPMA copolymer - PTX conjugate with Mw of 48 kDa ( P - PTX ) , and mP - PTX ."}
{"Chemical": ["PTX", "HPMA"]}